POV-Ray: Newsgroups: povray.general: simple incorrect shading of a bicubic patch example: simple incorrect shading of a bicubic patch example

POV-Ray : Newsgroups : povray.general : simple incorrect shading of a bicubic patch example : simple incorrect shading of a bicubic patch example		Server Time 28 Jun 2024 02:02:17 EDT (-0400)

From: Matthew Bennett
Date: 2 Oct 1998 19:54:10
Message: <36155992.0@news.povray.org>

Attached is a simple (1k) .pov scene showing the supposed POV 3.1r1 bicubic
patch bug.
It's just a bicubic patch next to a disk with a light source below them and
the camera looking above them.  The disk is dark (in the shade) as would be
expected, but the bicubic patch is lit up as if the light was above it.

If you want to see a 8k jpg of what this renders as, take a look at:
http://www.btinternet.com/~bennett/shadebug.jpg

Feel free to play around with this to see if you can fix something, but I
think it clearly shows a bug in POV 3.1


Matt

--
Computers do what you *tell* them to do, not what you *want* them to do.

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Attachments:
Download 'shadebug.pov.txt' (1 KB)